6686642885 has 32 divisors (see below), whose sum is σ = 8760642912. Its totient is φ = 4869964800.

The previous prime is 6686642881. The next prime is 6686642909. The reversal of 6686642885 is 5882466866.

It can be written as a sum of positive squares in 16 ways, for example, as 942367204 + 5744275681 = 30698^2 + 75791^2 .

It is not a de Polignac number, because 6686642885 - 2² = 6686642881 is a prime.

It is a super-2 number, since 2×6686642885² = 89422386143042246450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686642881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1816667 + ... + 1820343.

It is an arithmetic number, because the mean of its divisors is an integer number (273770091).

Almost surely, 2^6686642885 is an apocalyptic number.

6686642885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6686642885 is a deficient number, since it is larger than the sum of its proper divisors (2074000027).

6686642885 is a wasteful number, since it uses less digits than its factorization.

6686642885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073.

The product of its digits is 26542080, while the sum is 59.

The square root of 6686642885 is about 81771.8954470300. The cubic root of 6686642885 is about 1883.9500173998.

The spelling of 6686642885 in words is "six billion, six hundred eighty-six million, six hundred forty-two thousand, eight hundred eighty-five".